(Java) Rabobank Refresh OAuth2 Access Token

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.)

For more information, see https://developer.rabobank.nl/implementoauth2

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get Rabobank OAuth2 Access Token

    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/rabobank.json");
    if (success != true) {
        return;
        }

    // {
    //   "token_type": "Bearer",
    //   "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
    //   "expires_in": 3600,
    //   "consented_on": 1584641121,
    //   "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
    //   "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
    //   "refresh_token_expires_in": 157784760,
    //   "expires_on": "1584644722"
    // }

    // Refresh the access token by sending a POST like this:
    // 

    // POST /oauth2/token
    // Headers:
    //     Content-Type: application/x-www-form-urlencoded
    //     Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
    // 
    // Body (x-www-form-urlencoded):
    //     grant_type: refresh_token
    //     refresh_token: REFRESH_TOKEN

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","refresh_token");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));

    CkHttp http = new CkHttp();

    // Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
    http.put_BasicAuth(true);
    http.put_Login("YOUR_APP_CLIENT_ID");
    http.put_Password("YOUR_APP_CLIENT_SECRET");

    CkHttpResponse resp = http.PostUrlEncoded("https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",req);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    // Load the JSON response.
    json.Load(resp.bodyStr());
    json.put_EmitCompact(false);

    // Show the JSON response.
    System.out.println(json.emit());

    System.out.println("Response status code: " + resp.get_StatusCode());

    // If the response status code is not 200, then it's an error.
    if (resp.get_StatusCode() != 200) {
        return;
        }

    // Save the refreshed access token JSON to a file for future requests.
    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile("qa_data/tokens/rabobank.json",json.emit(),"utf-8",false);
  }
}